Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1990CAVALIER BASE, 4D SEDAN, AUTOMATIC, 125C/MD9REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 2.2L TBISCAN TESTER USAGESCAN DATA
1990 Chevrolet Cavalier Base, 4D Sedan, Automatic, 125C/MD9
Scan Data
1990 Chevrolet Cavalier Base, 4D Sedan, Automatic, 125C/MD9SECTION Scan Data
NOTE:
Information contained in the following tables is typical of readings taken on vehicle with engine idling, upper radiator hose hot, closed throttle, transmission in Park or Neutral, closed loop status achieved and all accessories off (except as noted in tables). Data parameters are updated every 1 1/4 seconds. On systems using P-4 computers, parameter updates are more often. Not all devices & systems are used on all models.
THROTTLE BODY INJECTION
| Tester Position | Units Measured | Nominal Value |
|---|---|---|
| A/C Clutch | On/Off | Off (On with A/C) |
| A/C Request | Yes/No | No/Yes (with request) |
| AIR Divert Sol. | On/Off | On (air to switching sol.); Off (air to atmosphere) |
| AIR Switching Sol. | On/Off | On (to exhaust manifold); Off (to catalytic converter) |
| BARO | Volts | 3-4.5 |
| Battery Voltage | Volts | 13.5-14.5 |
| Block Learn | Counts | 118-138 (128 normal) |
| Brake Switch | On/Off | On when engaged |
| Canister Purge Sol. | On/Off | On/engine cold (idle some) |
| Clear Flood | On/Off | ***See Tester Manual*** |
| Coolant Fan | On/Off | Off below 216°F (102°C) |
| Coolant Temp. | °C | 85-105° (norm. temperature) |
| Crank RPM | RPM | 100-900 |
| Cross Counts | Counts | 0-255 |
| Cruise Cont. Sw. | On/Off | On when engaged |
| EGR Solenoid | On/Off | On when energized |
| EGR Duty Cycle | 0-100% | 0/closed-100/fully open |
| Fan Relay | On/Off | On when energized |
| Fan Request | On/Off | On with request |
| Fuel Back-Up | Yes/No | Yes when engaged |
| IAC | Counts | 0-50 |
| Ignition/Crank | On/Off | On with ignition/crank |
| Injector Pulse Width | Mil./Sec | .8-3.0 |
| INT (Integrator) | Counts | 110-145 (128 normal) |
| Knock Signal | Yes/No | Yes when knock exists |
| MAT | °C | 10-90° |
| MAP | Volts | 1 (idle) to 4.5 (WOT) |
| Open/Closed Loop Status | OL/CL | Closed/Open during, extended idle |
| O2 Sensor | Millivolts | 100 (lean) to 999 (rich) |
| P/N Switch | P/N/RDL | Park/Neutral |
| P/S Switch | Norm/Hi | Normal |
| PROM I.D. | PROM # | Original factory number |
| RPM | RPM | Spec. +/-25 RPM Drive (A/T); Spec. +/-50 RPM Neut. (M/T) |
| Spark Advance | No. Deg | Varies |
| TCC | On/Off | Off (On with command) |
| TPS | Volts | 1.25 (idle) to 5.0 (WOT) |
| Throttle Angle | 0-100% | 0 (idle) to 110 (WOT) |
| Trouble Codes | Code # | No codes |
| Turbo Boost | On/Off | On when activated |
| Upshift Light (M/T) | On/Off | Off |
| VSS or MPH | MPH | 0-actual |
| 3rd Gear Switch | On/Off | On/3rd & 4th gear |
| 4th Gear Switch | On/Off | On/4th gear |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.